Drinking tumbler



FIG. 1 is a left side elevational view of a drinking tumbler showing my new ornamental design;

FIG. 2 is a plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a sectional view taken along line 4--4 of FIG. 2 and showing my new ornamental design; and,

FIG. 5 is a sectional view taken along line 5--5 of FIG. 1 and showing my new ornamental design. 

The ornamental design for a drinking tumbler, as shown and described. 